Spin-crossover in an iron(iii) complex showing a broad thermal hysteresis

2021 ◽  
Author(s):  
Cyril Rajnák ◽  
Romana Mičová ◽  
Ján Moncoľ ◽  
Ľubor Dlháň ◽  
Christoph Krüger ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Mononuclear Complex ◽  
Hysteresis Width ◽  
Thermally Induced

A pentadentate Schiff-base ligand 3,5Cl-L2− and NCSe− form a iron(iii) mononuclear complex [Fe(3,5Cl-L)(NCSe)], which shows a thermally induced spin crossover with a broad hysteresis width of 24 K between 123 K (warming) and 99 K (cooling).

scholarly journals Bistable Spin-Crossover in a New Series of [Fe(BPP-R)2] 2+ (BPP = 2,6-Bis(pyrazol-1-Yl)pyridine; R =CN) Complexes

2020 ◽  
Author(s):  
Senthil Kumar Kuppusamy ◽  
Nicolas Del Giudice ◽  
Benoit Heinrich ◽  
Laurent Douce ◽  
Mario Ruben
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Molecular Complexes ◽  
Solvent Free ◽  
Hysteresis Width

<p><i>A new series of iron(II) complexes—[Fe(BPP-CN)<sub>2</sub>](X)<sub>2</sub>, X = BF<sub>4</sub> <b>(1a-d) </b>or ClO<sub>4 </sub><b>(2)</b>—belonging to the [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes showed abrupt and hysteretic, that is, bistable, spin-crossover (SCO) characteristics. Among the complexes, the lattice solvent-free complex <b>2</b> showed a stable and complete SCO (T<sub>1/2 </sub>= 241 K) with a thermal hysteresis width (ΔT) of 28 K, the widest ΔT so far reported for a [Fe(BPP-R)<sub>2</sub>](X)<sub>2 </sub>family of complex, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)<sub>2</sub>](X)<sub>2 </sub>series of molecular complexes is encouraging to pursue [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> systems for the realization of technologically relevant SCO complexes. </i></p>

Steric Trapping of the High Spin State in FeIII Quinolylsalicylaldimine Complexes

2014 ◽  
Vol 67 (11) ◽  
pp. 1574 ◽  
Author(s):  
Darunee Sertphon ◽  
David J. Harding ◽  
Phimphaka Harding ◽  
Keith S. Murray ◽  
Boujemaa Moubaraki ◽  
...  
Keyword(s):  
Schiff Base ◽  
Electronic Properties ◽  
High Spin ◽  
Spin State ◽  
Schiff Base Ligand ◽  
Room Temperature ◽  
Spin Crossover ◽  
High Spin State ◽  
Electrochemical Studies ◽  
Magnetic Studies

A new sterically bulky Schiff base ligand, N-(8-quinolyl)-5-tert-butylsalicylaldimine (Hqsal-5-tBu) has been prepared and a series of FeIII complexes, [Fe(qsal-5-tBu)2]Y (Y = Cl 1, ClO4 2, NO3 3, BF4 4) utilising this ligand are reported and fully characterised. UV-vis spectroscopic and electrochemical studies indicate that 1–4 are high spin (HS) in solution at room temperature and further suggest that the tBu group only slightly alters the electronic properties of 1–4 compared with related [Fe(qsal-5-X)2]+ systems. The structures of [Fe(qsal-5-tBu)2]Cl·4MeOH·H2O 1, [Fe(qsal-5-tBu)2]ClO4·MeOH 2, and [Fe(qsal-5-tBu)2]NO3 3 determined at 100 K reveal HS FeIII centres in all cases. Four-fold parallel aryl embraces and π–π interactions serve to link the cations forming 2D sheets mirroring the motifs found in other [Fe(qsal-5-X)2]+ complexes. Despite this the tBu group causes strong distortions at the Fe centre which as magnetic studies reveal prevent spin crossover trapping 1–4 in the HS state.

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

2015 ◽  
Vol 3 (30) ◽  
pp. 7916-7924 ◽  
Author(s):  
C. Bartual-Murgui ◽  
E. Natividad ◽  
O. Roubeau
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Critical Assessment ◽  
Hysteresis Width ◽  
Potential Applications

Nanoparticles of the compound [Fe(Htrz)2trz]BF4 are shown to have a rod shape. Their size is found to control the width of the thermal hysteresis displayed in the spin crossover of this material, while the removal of surfactant results systematically in a reduction of the hysteresis width, by up to 16 K, both effects being original and important for potential applications.

Structure–function correlations in mononuclear manganese(iii) spin crossover systems with a big conjugated hexadentate Schiff-base ligand

2020 ◽  
Vol 49 (14) ◽  
pp. 4293-4305 ◽  
Author(s):  
Sheng-Ze Zhao ◽  
Chun-Yan Qin ◽  
Shi Wang ◽  
Masahiro Yamashita ◽  
Yong-Hua Li ◽  
...  
Keyword(s):  
Schiff Base ◽  
Structure Function ◽  
Schiff Base Ligand ◽  
Spin Crossover

Different SCO processes with a big conjugated hexadentate Schiff-base ligand reported in d4 SCO chemistry.

scholarly journals Effects of Metal Doping on the Spin-Crossover Properties of an Iron(II) Complex with Extended π-Conjugated Schiff-Base Ligand Having an N4O2Donor Set

2009 ◽  
Vol 82 (3) ◽  
pp. 333-337 ◽  
Author(s):  
Zhong Yu ◽  
Takayoshi Kuroda-Sowa ◽  
Hiroaki Kume ◽  
Takashi Okubo ◽  
Masahiko Maekawa ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Metal Doping

scholarly journals Bistable Spin-Crossover in a New Series of [Fe(BPP-R)2] 2+ (BPP = 2,6-Bis(pyrazol-1-Yl)pyridine; R =CN) Complexes

2020 ◽  
Author(s):  
Senthil Kumar Kuppusamy ◽  
Nicolas Del Giudice ◽  
Benoit Heinrich ◽  
Laurent Douce ◽  
Mario Ruben
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Molecular Complexes ◽  
Solvent Free ◽  
Hysteresis Width

<p><i>A new series of iron(II) complexes—[Fe(BPP-CN)<sub>2</sub>](X)<sub>2</sub>, X = BF<sub>4</sub> <b>(1a-d) </b>or ClO<sub>4 </sub><b>(2)</b>—belonging to the [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes showed abrupt and hysteretic, that is, bistable, spin-crossover (SCO) characteristics. Among the complexes, the lattice solvent-free complex <b>2</b> showed a stable and complete SCO (T<sub>1/2 </sub>= 241 K) with a thermal hysteresis width (ΔT) of 28 K, the widest ΔT so far reported for a [Fe(BPP-R)<sub>2</sub>](X)<sub>2 </sub>family of complex, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)<sub>2</sub>](X)<sub>2 </sub>series of molecular complexes is encouraging to pursue [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> systems for the realization of technologically relevant SCO complexes. </i></p>

Spin Crossover of a Hydrogen-Bonded Dimeric FeIIIComplex with an Unequivalent Tetradentate Schiff Base Ligand and Two Imidazoles

2005 ◽  
Vol 78 (8) ◽  
pp. 1484-1486 ◽  
Author(s):  
Tokimitsu Fukukai ◽  
Kazuya Yabe ◽  
Yoshihiro Ogawa ◽  
Naohide Matsumoto ◽  
Jerzy Mrozinski
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Tetradentate Schiff Base ◽  
Hydrogen Bonded

Bi-stable spin-crossover characteristics of a highly distorted [Fe(1-BPP-COOC2H5)2](ClO4)2·CH3CN complex

2019 ◽  
Vol 48 (12) ◽  
pp. 3825-3830 ◽  
Author(s):  
Kuppusamy Senthil Kumar ◽  
Benoît Heinrich ◽  
Sergi Vela ◽  
Eufemio Moreno-Pineda ◽  
Corinne Bailly ◽  
...  
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Angular Distortion ◽  
Hysteresis Width ◽  
State Switching ◽  
Switching Characteristics

A HS Fe(ii) complex, see figure, with a pronounced angular distortion (ϕ) = 158.83(17)° showed lattice solvent dependent spin-state switching characteristics with a thermal hysteresis width (ΔT) of 101 K.

Spin crossover complexes of iron(III) with an N4 tetradentate Schiff base ligand

1995 ◽  
Vol 232 (1-2) ◽  
pp. 183-187 ◽  
Author(s):  
Greg Brewer ◽  
Jerry Jasinski ◽  
William Mahany ◽  
Leopold May ◽  
Sergey Prytkov
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Tetradentate Schiff Base ◽  
Spin Crossover Complexes
Sign in / Sign up

Export Citation Format

Share Document